HardLabs

Bfunc

Cushychicken·bfunc·hardware/bfunc.kicad_pcb

Bfunc PCB layout, top view — open source STM32 board by Cushychicken

About the Bfunc PCB

Bfunc is an open source STM32 PCB design by Cushychicken, published on GitHub. It is a 2-layer board measuring 63.5 × 25.4 mm, with 45 components from 29 distinct parts.

Its main chip is the STM32F072C8Tx, from the STM32 family. Other key parts include the AD9837 and MIC5504-3.3YM5. By type, the board carries 19 capacitors, 9 resistors, 8 connectors, 3 ICs, 2 crystals and 2 test points.

It belongs with the dev boards & breakouts designs in this gallery.

From the project

Open Source, Breadboard-Friendly Function Generator Design

These are the source files for bfunc, a function generator I've been desiging, building, and programming in my spare time.

The fastest way to understand what's going on here is to read the design document. That should give you a good top-level understanding of this project. If it doesn't, there's a Contact link on my blog. I encourage you to let me know if there's something you don't understand, or is otherwise unclear!

Main components on the Bfunc

AD9837STM32F072C8TxMIC5504-3.3YM5

Bfunc bill of materials (BOM)

45 components, 29 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AD9837
U1
1
STM32F072C8Tx
U2
1
MIC5504-3.3YM5
U3
1
SG-5032CAN
X1
1
Crystal
Y1
1
Conn_02x03_Odd_Even
J1
1
Conn_01x02_Male
J2
1
Conn_Coaxial
J3
1
Conn_01x03_Male
J4
1
Conn_02x05_Odd_Even
J5
1
USB_B_Micro
J6
2
Conn_01x20_Male
J9, J10
1
SW_Push
SW1
2
TestPoint
TP1, TP2
1
Ferrite_Bead
FB1
7
100nF
C1, C3, C4, C5, C11, C12, C14
1
10uF
C2
2
10nF
C6, C13
1
100pF
C7
2
10pF
C8, C9
Show 9 more
QtyPartRefs
2
4.7uF
C10, C16
3
1uF
C15, C18, C20
1
4.5nF
C17
2
10k
R1, R3
1
330R
R2
1
2.2K
R4
1
390R
R5
3
0R
R6, R7, R8
1
1M
R9

Bfunc design files

The KiCad project lives in the Cushychicken/bfunc repository on GitHub; these links point at the commit this page was built from.

Bfunc: common questions

What microcontroller does the Bfunc use?

The Bfunc is built around the STM32F072C8Tx, from the STM32 family.

How big is the Bfunc PCB?

The Bfunc measures 63.5 × 25.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Bfunc?

45 components, from 29 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Bfunc design files?

From the Cushychicken/bfunc repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Bfunc design in my own project?

The repository has no license, so all rights stay with Cushychicken. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Bfunc without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

Similar boards